One more feature I'd love to see a grip have is a switch to prevent the front/real dials (main body and grip) from registering input in shooting mode. I find myself often accidentally changing aperture/shutter speed when picking up and putting down the camera when using the grip. I've gotten more conscious of it over the years and better at avoiding it, but would be cool to have a way to suppress spurious input completely.

There's an on / off switch on the grip. It doesn't turn the power off, it disables the buttons on the grip.